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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.util;

import org.jgroups.Address;
import org.jgroups.Message;

import java.util.Collection;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * A cache associating members and messages
 * @author Bela Ban
 * @since  5.3.2
 */
public class MessageCache {
    protected final Map> map=new ConcurrentHashMap<>();
    protected volatile boolean                  is_empty=true;

    public MessageCache add(Address sender, Message msg) {
        Queue list=map.computeIfAbsent(sender, addr -> new ConcurrentLinkedQueue<>());
        list.add(msg);
        is_empty=false;
        return this;
    }

    public Collection drain(Address sender) {
        if(sender == null)
            return null;
        Queue queue=map.remove(sender);
        if(map.isEmpty())
            is_empty=true;
        return queue;
    }

    public MessageCache clear() {
        map.clear();
        is_empty=true;
        return this;
    }

    /** Returns a count of all messages */
    public int size() {
        return map.values().stream().mapToInt(Collection::size).sum();
    }

    public boolean isEmpty() {
        return is_empty;
    }

    public String toString() {
        return String.format("%d message(s)", size());
    }
}